<template>
    <div>
         <!-- 面包屑导航区 -->
       <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
       </el-breadcrumb>
       <!-- 卡片区域 -->
             <el-card>
             <!-- Alert警告 -->
             <el-alert
               title="添加商品信息"
               type="info"
               center
               show-icon
               :closable="false">
             </el-alert>
             <!-- 步骤条 -->
             <el-steps :space="200" :active="activeIndex -0" finish-status="success" align-center>
               <el-step title="基本信息"></el-step>
               <el-step title="商品参数"></el-step>
               <el-step title="商品属性"></el-step>
               <el-step title="商品图片"></el-step>
               <el-step title="商品内容"></el-step>
               <el-step title="完成"></el-step>
             </el-steps>
             <!-- tab栏区域 -->
             <el-form :model="addForm" :rules="addFormRules" 
             ref="addFormRef" label-width="100px" label-position="top">
             <el-tabs v-model="activeIndex" :tab-position="'left'" 
             :before-leave ="beforeTabLeave" @tab-click="tabClicked">
                <el-tab-pane label="基本信息" name="0">
                    <el-form-item label="商品名称" prop="goods_name">
                      <el-input v-model="addForm.goods_name"></el-input>
                    </el-form-item>
                    <el-form-item label="商品价格" prop="goods_price">
                      <el-input v-model="addForm.goods_price" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品重量" prop="goods_weight">
                      <el-input v-model="addForm.goods_weight" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品数量" prop="goods_number">
                      <el-input v-model="addForm.goods_number" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品分类" prop="goods_cat">
                        <el-cascader
                          clearable
                          v-model="addForm.goods_cat"
                          :props="cateProps"
                          :options="cateList"
                          @change="handleChange"></el-cascader>
                    </el-form-item>
                </el-tab-pane>                
                <el-tab-pane label="商品参数" name="1">
                  <!-- 渲染表单的Item项 -->
                  <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                    <!-- 复选框组 -->
                     <el-checkbox-group v-model="item.attr_vals">
                       <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i"  border></el-checkbox>
                     </el-checkbox-group>
                  </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品属性" name="2">
                  <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                    <el-input v-model="item.attr_vals"></el-input>
                  </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品图片" name="3">
                  <!-- action=图片上传的API地址 -->
                  <el-upload :action="uploadURL" :on-preview="handlePreview" :on-remove="handleRemove"
                    list-type="picture" :headers="headerObj" :on-success="handleSuccess">
                    <el-button size="small" type="primary">点击上传</el-button>
                  </el-upload>
                </el-tab-pane>
                <el-tab-pane label="商品内容" name="4">
                  <!-- 富文本编辑器组件 -->
                  <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                  <!-- 按钮 -->
                  <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
                </el-tab-pane>
              </el-tabs>
              </el-form>
    
       </el-card>
            <!-- 图片预览 -->
            <el-dialog
            title="图片预览"
            :visible.sync="previewVisible"
            width="50%">
            <img :src="previewPath" class="previewImg" >
          </el-dialog>
    </div>
</template>

<script>
import _ from 'lodash'

export default {
    data(){
        return{
            activeIndex:'0',
            // 添加商品的表单数据对象
            addForm:{
                goods_name:'',
                goods_price:0,
                goods_weight:0,
                goods_number :0,
                // 商品所属的分类数据
                goods_cat:[],
                // 图片数组
                pics:[],
                // 商品的详情描述
                goods_introduce:'',
                attrs:[]

            },
            addFormRules:{
                goods_name:[
                    {required:true, message:'请输入商品名称', trigger:'blur'},                
                    ],
                 goods_price:[
                    {required:true, message:'请输入商品价格', trigger:'blur'},               
                    ],
                 goods_weight:[
                    {required:true, message:'请输入商品重量', trigger:'blur'},          
                    ],
                 goods_number:[
                    {required:true, message:'请输入商品数量', trigger:'blur'},             
                    ],
                 goods_cat:[
                    {required:true, message:'请选择商品分类', trigger:'blur'},
                    ]
            },
            // 商品分类数据
            cateList:[],
            // 
            cateProps:{
                value:'cat_id',
                label:'cat_name',
                children:'children'
            },
            // 动态参数列表数据
            manyTableData:[],
            // 静态属性列表数据
            onlyTableData:[],
            // 上传图片的URL地址
            uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',
            // 图片上传组件的headers请求头对象
            headerObj:{
              Authorization:window.sessionStorage.getItem('token')
            },
            // 预览图片的路径
            previewPath:'',
            // 
            previewVisible:false
            

        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        // 获取所有商品分类数据
        async getCateList(){
            const{data:res} = await this.$http.get('categories')

            if(res.meta.status !==200){
                return this.$message.error('获取商品分类数据失败！')
            }

            this.cateList = res.data
            console.log(this.cateList)
        },
        // 级联选择器选中项变化 ，会触发这个函数
        handleChange(){
            console.log(this.addForm.goods_cat)
            if(this.addForm.goods_cat.length !== 3){
              this.addForm.goods_cat = []
            }
        },
        // 
        beforeTabLeave(activeName,oldActiveName){
          // console.log('即将离开的标签页名字是：' + oldActiveName)
          // console.log('即将进入的标签页名字是：' + activeName)
          // return false
           if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3){
             this.$message.error('请先选择商品分类')
             return false
           }
        },
        // 
        async tabClicked(){
          // console.log(this.activeIndex)
          // 证明访问的是动态参数面板
          if(this.activeIndex === '1'){
            // console.log('动态参数面板')
            const{data: res}= await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'many'}})
            
            if(res.meta.status !== 200){
            return this.$message.error('获取动态参数列表失败！')
            }

            console.log(res.data)
            res.data.forEach(item => {
              item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
            })
            this.manyTableData = res.data 
          }else if(this.activeIndex === '2'){
            // console.log('动态参数面板')
            const{data: res}= await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'only'}})
            
            if(res.meta.status !== 200){
            return this.$message.error('获取静态属性失败！')
            }
            console.log(res.data)
            this.onlyTableData = res.data
            
          }
          
        },
        // 图片预览 
        handlePreview(file){
          console.log(file)
          this.previewPath = file.response.data.url
          this.previewVisible = true
        },
        // 移除图片
        handleRemove(file){
          console.log(file)
          // 1.获取将要删除的图片的临时路径
          const filePath = file.response.data.tmp_path
          // 2.从pics数组中，找到这个图片对应的索引值
          const i = this.addForm.pics.findIndex(x => x.pic ===filePath)
          // 3.调用数组的splice方法，把图片信息对象，从pics数组中移除
          this.addForm.pics.splice(i,1)
          console.log(this.addForm)
        },
        // 监听图片上传成功的事件
        handleSuccess(response){
          console.log(response)
          // 1.拼接得到一个图片信息对象
          const picInfo = {pic:response.data.tmp_path}
          // 2.将图片信息对象，push到pics数组中
          this.addForm.pics.push(picInfo)
          console.log(this.addForm)
        },
        // 添加商品
        add(){
          this.$refs.addFormRef.validate(async valid => {
            if(!valid){
              return this.$message.error('请填写必要的表单项！')
            }
            // 执行添加的业务逻辑
            // lodash 深拷贝
            const form =  _.cloneDeep(this.addForm)
            form.goods_cat = form.goods_cat.join(',')
            // 处理动态参数
            this.manyTableData.forEach(item => {
              const newInfo = {
                "attr_id":item.attr_id,
                "attr_value":"item.attr_vals.join(' ')"}
              this.addForm.attrs.push(newInfo)
            })

            // 处理静态参数
            this.onlyTableData.forEach(item => {
              const newInfo = {
                "attr_id":item.attr_id,
                "attr_value":"item.attr_vals"}
              this.addForm.attrs.push(newInfo)
            })

            form.attrs = this.addForm.attrs
            console.log(form)

            // 发起请求添加商品
            // 商品的名称，必须是唯一的
            const{data:res} = await this.$http.post('goods',form)

            if(res.meta.status !== 201){
              return this.$message.error('添加商品失败！')
            }

            this.$message.success('添加商品成功！')
            this.$router.push('/goods')
          })
        }

    },
    computed:{
      cateId(){
        if(this.addForm.goods_cat.length === 3){
          return this.addForm.goods_cat[2]
        }
        return null
      }
    }
}
</script>


<style lang="less" scoped>
.el-checkbox{
  margin: 0;
}
.previewImg{
  width: 100%;
}
.btnAdd{
  margin-top: 15px;
}
</style>